US20090152321A1 - Hand-held drive-in tool - Google Patents
Hand-held drive-in tool Download PDFInfo
- Publication number
- US20090152321A1 US20090152321A1 US12/316,541 US31654108A US2009152321A1 US 20090152321 A1 US20090152321 A1 US 20090152321A1 US 31654108 A US31654108 A US 31654108A US 2009152321 A1 US2009152321 A1 US 2009152321A1
- Authority
- US
- United States
- Prior art keywords
- drive
- roller
- guide
- ram
- tool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
- B25C1/00—Hand-held nailing tools; Nail feeding devices
- B25C1/06—Hand-held nailing tools; Nail feeding devices operated by electric power
Definitions
- the present invention relates to a hand-held drive-in power tool for driving in fastening elements and including a guide, a drive-in ram displaceable in the guide, drive means for driving the drive-in ram and including at least one preloaded drive spring, a tensioning device for preloading the drive spring, a transmission element for transmitting a tensioning force from the tensioning device to the drive spring, at least one roller for guiding the transmission element, and a support element for supporting the at least one roller.
- An object of the present invention is to further improve the efficiency of a drive-in tool such as described in the above-discussed U.S. Patent Publication.
- a rolling bearing for supporting the at least one roller on the support element.
- the bearing prevents sliding friction losses, which otherwise are produced between the at least one roller and the support element.
- the rolling bearing increases the efficiency of the entire system.
- the guide element is formed by guide webs provided at opposite axial ends of the at least one roller.
- the guide element is formed as a radial circumferential groove provided on the at least one roller, with the transmission element having a guide rib engaging in the groove.
- the guide element is formed by a keg-shaped circumferential profile of the at least one roller.
- FIG. 1 a longitudinal cross-sectional view of a drive-in power tool according to the present invention in its initial position
- FIG. 2 a longitudinal cross-sectional view of the drive-in power tool according to FIG. 1 in its operational position
- FIG. 3 a partial cross-sectional view of a detail of the drive-in power tool shown in FIG. 1 and which is marked with a reference sign III;
- FIG. 4 a cross-sectional view along line IV-IV in FIG. 3 ;
- FIG. 5 a view similar to that of FIG. 4 of another embodiment of a drive-in tool according to the present invention.
- FIG. 6 a view similar to that of FIG. 4 of yet another embodiment of a drive-in tool according to the present invention.
- a drive-in tool 10 which is shown in FIGS. 1-4 , has a housing 11 and located in the housing 11 , drive means, which is generally indicated with a reference numeral 30 , for driving a drive-in ram 13 displaceable in a guide 12 likewise located in the housing 10 .
- the drive-in ram 13 has a driving section 14 and a head section 15 .
- a bolt guide 17 adjoins an end of the guide 12 facing in the drive-in direction 27 and is arranged coaxially with the guide 12 .
- a magazine 61 for fastening elements is arranged sidewise of the bolt guide 17 .
- fastening elements 60 are stored.
- the drive means 30 includes a drive spring 31 and a transmission mechanism, which is generally indicated with a reference numeral 32 and which engages the head section 15 of the drive-in ram 13 .
- the driving force generated by the drive spring 31 is transmitted to the drive-in ram 13 via the transmission mechanism 32 .
- the drive spring 31 is formed as a helical spring.
- the transmission mechanism 32 is formed in the embodiment shown in FIGS. 1-4 as a rope drive.
- the drive spring 31 is arranged between an abutment 36 fixedly secured to the housing 10 in a support element 35 which is formed as a take-off annular spring member. At an end of the take-off element 35 remote from the drive spring 31 , two opposite rollers 34 are rotatably supported by rolling bearings 40 , as particularly shown in FIG.
- the rolling bearings 40 are formed, e.g., as ball bearings, with the balls forming rolling bodies 49 .
- a rope or band-shaped transmission element 33 is guided by the rollers 34 about the support element 35 .
- guide elements formed by guide webs 46 , respectively.
- the guide webs 46 insure that the transmission element 33 is centrally guided over the rollers 34 (see, in particular, FIG. 4 ). Simultaneously, the transmission element 33 is guide about the free end of the head section 15 of the drive-in ram 13 .
- the drive-in ram 13 is resiliently preloaded by the transmission mechanism 32 against the drive spring 31 .
- the head section 15 of the drive-in ram 13 together with the surrounding it transmission element 33 , extends into a cylindrical guide chamber 37 which is defined by the support element 35 , drive spring 31 , and the abutment 36 .
- the drive-in ram 13 is held with a locking device generally indicated with a reference numeral 50 .
- the locking device 50 has a pawl 51 that engages, in a locking position 54 (see FIG. 1 ), a locking surface 53 of a projection 58 of the drive-in ram 13 , holding the drive-in ram 13 against the biasing force of the drive spring 31 .
- the pawl 51 is supported on a servomotor 52 and is displaced thereby into a release position 55 shown in FIG. 2 , which would be described in detail further below.
- An electrical first control conductor 56 connects the servomotor 52 with a control unit 23 .
- the drive-in power tool 10 further has a handle 20 on which there is provided an actuation switch 19 for initiating a drive-in process with the drive-in power tool 10 .
- a power source generally indicated with a reference numeral 21 and which provides electrical energy for the power tool 10 .
- the power source 21 contains at least one accumulator.
- the power source 21 is connected by electrical conductors 24 with both the control unit 23 and the actuation switch 19 .
- the control unit 23 is also connected with the actuation switch 19 by a switch conductor 57 .
- switch means 29 which is electrically connected with the control unit 23 by an electrical conductor 28 .
- the switch means 29 communicates an electrical signal to the control unit 23 as soon as the drive-in power tool 10 is pressed against a constructional component U, as shown in FIG. 2 , which insures that the drive-in power tool 10 only then can be actuated when it is properly pressed against the constructional component.
- the tensioning device 70 has a motor 71 for driving a drive roller 72 .
- the motor 71 is connected with the control unit 23 by a second control conductor 74 and is actuated by the control unit 23 when, e.g., the drive-in ram 13 is located in its end, in the drive-in direction 27 , position or when the drive-in power tool 10 is lifted off the constructional component.
- the motor 71 has output means 75 such as, e.g., an output gear, connected with a drive roller 72 .
- the drive roller 72 is rotatably supported on a longitudinally adjustable arm 78 of adjusting means 76 formed as a solenoid.
- the adjusting means 76 is connected with the control unit 23 by an adjusting conductor 77 . During the operation, the drive roller 72 rotates in a direction of arrow 73 which is shown with dash lines.
- the control unit 23 When the drive-in power tool is actuated with a main switch, not shown, the control unit 23 insures that the drive-in ram 13 remains in its initial position shown in FIG. 1 . If this is not the case, then the drive roller 72 of the adjusting means 76 is displaced toward output gear 75 , which is rotated by the motor 71 , and engages the output gear 75 . Simultaneously, the drive roller 72 engages the drive-in ram 13 which is displaced by the drive roller 72 , which rotates in the direction shown with arrow 73 , in a direction of the drive means 30 , preloading the drive spring 32 of the drive means 30 .
- the pawl 51 of the locking device 50 pivoting about its axis, engages the locking surface 53 of the drive-in ram 13 , retaining same in the initial position 22 .
- the motor 71 can be turned off by the control unit 23 .
- the adjusting means 76 under control of the control unit 23 , displaces the drive roller 72 from it engagement position with the output means 75 and the drive-in ram 13 to its disengagement position (see FIG. 2 ).
- control means 23 When the drive-in tool 10 is pressed against the constructional component U, then control means 23 is shifted by the switch means 29 to its setting-in ready position. Then, when the actuation switch 19 is actuated by the tool user, the control unit 23 displaces the locking device 50 into its release position 55 , whereby the pawl 51 is lifted by the servomotor 52 off the locking surface 53 of the drive-in ram 13 . The pawl 51 is biased in the direction of the drive-in ram 13 .
- the drive-in ram 13 upon being released by the locking device 50 , is displaced by the drive spring 31 of the drive means 30 in the drive-in direction 27 , driving a fastening element 60 in the constructional component U.
- the expansion path (arrow 45 ) of the drive spring 31 is so converted by the transmission mechanism 32 that the acceleration path (arrow 44 ) of the drive-in ram 13 is longer than the expansion path (arrow 45 ) of the drive spring 31 .
- the transmission ratio of the transmission mechanism 32 amount, in the embodiment discussed here, to 1:2.
- the tensioning device 70 is actuated by the control unit 23 when the drive-in power tool 10 is lifted off the constructional component U.
- the switch means 29 communicates a signal to the control unit 23 .
- the tensioning device 70 displaces the drive-in ram 13 , in a manner described above, against the drive spring 31 until the pawl 51 engages, in its locking position 54 , the locking surface 53 of the drive-in ram 13 .
- a drive-in tool which is shown in FIG. 5 distinguishes from the drive-in tool described above with reference to FIGS. 1-4 in that instead of two guide webs, which form the guide means, a guide groove 47 a , which serves as guide means, is provided on each of the rollers 34 .
- the transmission element 33 is provided with a guide rib 47 b that engages in the guide grooves 47 a of the rollers 34 .
- a drive-in tool which is shown in FIG. 6 distinguishes from the drive-in tools described above in that each of the rollers 34 has a keg-shaped circumferential profile that serves as guide means for centrally guiding the transmission member over the rollers 34 .
- FIGS. 4-6 Naturally, a combination of guide means shown in FIGS. 4-6 is also possible.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
Description
- 1. Field of the Invention
- The present invention relates to a hand-held drive-in power tool for driving in fastening elements and including a guide, a drive-in ram displaceable in the guide, drive means for driving the drive-in ram and including at least one preloaded drive spring, a tensioning device for preloading the drive spring, a transmission element for transmitting a tensioning force from the tensioning device to the drive spring, at least one roller for guiding the transmission element, and a support element for supporting the at least one roller.
- 2. Description of the Prior Art
- A drive-in tool of the type discussed above is disclosed in U.S. Patent Publication US 2007/0023472 A1. The drive-in tool includes a drive-in ram for driving in fastening elements and displaceable toward the drive-in tool mouth by a drive spring. The tensioning device for displacing the drive spring into a preloaded position includes an electric motor and a transmission element that is guided over a deflection roller. The rotational movement of the electric motor is transmitted to the drive spring by the drive-in ram and the transmission member, whereby the drive spring is preloaded.
- An object of the present invention is to further improve the efficiency of a drive-in tool such as described in the above-discussed U.S. Patent Publication.
- This and other objects of the present invention, which will become apparent hereinafter, are achieved by providing a rolling bearing for supporting the at least one roller on the support element. The bearing prevents sliding friction losses, which otherwise are produced between the at least one roller and the support element. The rolling bearing increases the efficiency of the entire system.
- Advantageously, the at least one roller has at least one guide element for centrally axially guiding the transmission element over the at least one roller. The guide element prevents a sidewise displacement of the transmission element (i.e., displacement in the axial direction of roller) and, thereby, energy losses caused by excessive friction or a non-uniform loading of the roller.
- In a constructively advantageous embodiment, the guide element is formed by guide webs provided at opposite axial ends of the at least one roller.
- According to an alternative embodiment, the guide element is formed as a radial circumferential groove provided on the at least one roller, with the transmission element having a guide rib engaging in the groove.
- According to another embodiment, the guide element is formed by a keg-shaped circumferential profile of the at least one roller.
- The novel features of the present invention, which are considered as characteristic for the invention, are set forth in the appended claims. The invention itself, however, both as to its construction and its mode of operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiment, when read with reference to the accompanying drawings.
- The drawings show:
-
FIG. 1 a longitudinal cross-sectional view of a drive-in power tool according to the present invention in its initial position; -
FIG. 2 a longitudinal cross-sectional view of the drive-in power tool according toFIG. 1 in its operational position; -
FIG. 3 a partial cross-sectional view of a detail of the drive-in power tool shown inFIG. 1 and which is marked with a reference sign III; -
FIG. 4 a cross-sectional view along line IV-IV inFIG. 3 ; -
FIG. 5 a view similar to that ofFIG. 4 of another embodiment of a drive-in tool according to the present invention; and -
FIG. 6 a view similar to that ofFIG. 4 of yet another embodiment of a drive-in tool according to the present invention. - A drive-in
tool 10 according to the present invention, which is shown inFIGS. 1-4 , has ahousing 11 and located in thehousing 11, drive means, which is generally indicated with areference numeral 30, for driving a drive-inram 13 displaceable in aguide 12 likewise located in thehousing 10. The drive-inram 13 has adriving section 14 and ahead section 15. - A
bolt guide 17 adjoins an end of theguide 12 facing in the drive-indirection 27 and is arranged coaxially with theguide 12. Sidewise of thebolt guide 17, amagazine 61 for fastening elements is arranged. In themagazine 61,fastening elements 60 are stored. - The drive means 30 includes a
drive spring 31 and a transmission mechanism, which is generally indicated with areference numeral 32 and which engages thehead section 15 of the drive-inram 13. The driving force generated by thedrive spring 31 is transmitted to the drive-inram 13 via thetransmission mechanism 32. Thedrive spring 31 is formed as a helical spring. Thetransmission mechanism 32 is formed in the embodiment shown inFIGS. 1-4 as a rope drive. Thedrive spring 31 is arranged between anabutment 36 fixedly secured to thehousing 10 in asupport element 35 which is formed as a take-off annular spring member. At an end of the take-off element 35 remote from thedrive spring 31, twoopposite rollers 34 are rotatably supported byrolling bearings 40, as particularly shown inFIG. 3 . Therolling bearings 40 are formed, e.g., as ball bearings, with the balls formingrolling bodies 49. A rope or band-shaped transmission element 33, the first and secondfree ends 41, 42 of which are secured to theabutment 36, is guided by therollers 34 about thesupport element 35. At the axial ends of therollers 34, there are provided guide elements formed byguide webs 46, respectively. Theguide webs 46 insure that thetransmission element 33 is centrally guided over the rollers 34 (see, in particular,FIG. 4 ). Simultaneously, thetransmission element 33 is guide about the free end of thehead section 15 of the drive-inram 13. - In the
initial position 22, shown inFIG. 1 , the drive-inram 13 is resiliently preloaded by thetransmission mechanism 32 against thedrive spring 31. Thehead section 15 of the drive-inram 13, together with the surrounding ittransmission element 33, extends into acylindrical guide chamber 37 which is defined by thesupport element 35, drivespring 31, and theabutment 36. With thehead section 15 of the drive-inram 13 being guided inguide chamber 37 between these elements and, in particular, within thedrive spring 31, advantageously, a compact construction is obtained. - In the
initial position 22, the drive-inram 13 is held with a locking device generally indicated with areference numeral 50. Thelocking device 50 has apawl 51 that engages, in a locking position 54 (seeFIG. 1 ), alocking surface 53 of aprojection 58 of the drive-inram 13, holding the drive-inram 13 against the biasing force of thedrive spring 31. Thepawl 51 is supported on aservomotor 52 and is displaced thereby into arelease position 55 shown inFIG. 2 , which would be described in detail further below. An electricalfirst control conductor 56 connects theservomotor 52 with acontrol unit 23. - The drive-in
power tool 10 further has ahandle 20 on which there is provided anactuation switch 19 for initiating a drive-in process with the drive-inpower tool 10. In thehandle 20, there is further arranged a power source generally indicated with areference numeral 21 and which provides electrical energy for thepower tool 10. In the embodiment described here, thepower source 21 contains at least one accumulator. Thepower source 21 is connected byelectrical conductors 24 with both thecontrol unit 23 and theactuation switch 19. Thecontrol unit 23 is also connected with theactuation switch 19 by aswitch conductor 57. - At a
mouth 62 of the drive-inpower tool 10, there is provided switch means 29 which is electrically connected with thecontrol unit 23 by anelectrical conductor 28. The switch means 29 communicates an electrical signal to thecontrol unit 23 as soon as the drive-inpower tool 10 is pressed against a constructional component U, as shown inFIG. 2 , which insures that the drive-inpower tool 10 only then can be actuated when it is properly pressed against the constructional component. - On the drive-in
power tool 10, there is further arranged a tensioning device generally indicated with areference numeral 70. Thetensioning device 70 has amotor 71 for driving adrive roller 72. Themotor 71 is connected with thecontrol unit 23 by asecond control conductor 74 and is actuated by thecontrol unit 23 when, e.g., the drive-inram 13 is located in its end, in the drive-indirection 27, position or when the drive-inpower tool 10 is lifted off the constructional component. Themotor 71 has output means 75 such as, e.g., an output gear, connected with adrive roller 72. Thedrive roller 72 is rotatably supported on a longitudinallyadjustable arm 78 of adjusting means 76 formed as a solenoid. The adjusting means 76 is connected with thecontrol unit 23 by an adjustingconductor 77. During the operation, thedrive roller 72 rotates in a direction ofarrow 73 which is shown with dash lines. - When the drive-in power tool is actuated with a main switch, not shown, the
control unit 23 insures that the drive-inram 13 remains in its initial position shown inFIG. 1 . If this is not the case, then thedrive roller 72 of the adjusting means 76 is displaced towardoutput gear 75, which is rotated by themotor 71, and engages theoutput gear 75. Simultaneously, thedrive roller 72 engages the drive-inram 13 which is displaced by thedrive roller 72, which rotates in the direction shown witharrow 73, in a direction of the drive means 30, preloading thedrive spring 32 of the drive means 30. When the drive-inram 13 reaches itsinitial position 22, thepawl 51 of thelocking device 50, pivoting about its axis, engages the lockingsurface 53 of the drive-inram 13, retaining same in theinitial position 22. Then, themotor 71 can be turned off by thecontrol unit 23. At the same time, the adjusting means 76, under control of thecontrol unit 23, displaces thedrive roller 72 from it engagement position with the output means 75 and the drive-inram 13 to its disengagement position (seeFIG. 2 ). - When the drive-in
tool 10 is pressed against the constructional component U, then control means 23 is shifted by the switch means 29 to its setting-in ready position. Then, when theactuation switch 19 is actuated by the tool user, thecontrol unit 23 displaces thelocking device 50 into itsrelease position 55, whereby thepawl 51 is lifted by theservomotor 52 off the lockingsurface 53 of the drive-inram 13. Thepawl 51 is biased in the direction of the drive-inram 13. - The drive-in
ram 13, upon being released by the lockingdevice 50, is displaced by thedrive spring 31 of the drive means 30 in the drive-indirection 27, driving afastening element 60 in the constructional component U. Advantageously, the expansion path (arrow 45) of thedrive spring 31 is so converted by thetransmission mechanism 32 that the acceleration path (arrow 44) of the drive-inram 13 is longer than the expansion path (arrow 45) of thedrive spring 31. The transmission ratio of thetransmission mechanism 32 amount, in the embodiment discussed here, to 1:2. - For returning the drive-in
ram 13 and for preloading thedrive spring 31, at the end of the drive-in process, thetensioning device 70 is actuated by thecontrol unit 23 when the drive-inpower tool 10 is lifted off the constructional component U. Upon thepower tool 10 being lifted off, the switch means 29 communicates a signal to thecontrol unit 23. Thetensioning device 70 displaces the drive-inram 13, in a manner described above, against thedrive spring 31 until thepawl 51 engages, in itslocking position 54, the lockingsurface 53 of the drive-inram 13. - A drive-in tool, which is shown in
FIG. 5 distinguishes from the drive-in tool described above with reference toFIGS. 1-4 in that instead of two guide webs, which form the guide means, aguide groove 47 a, which serves as guide means, is provided on each of therollers 34. For centrally guiding thetransmission element 33 over therollers 34, thetransmission element 33 is provided with aguide rib 47 b that engages in theguide grooves 47 a of therollers 34. - A drive-in tool, which is shown in
FIG. 6 distinguishes from the drive-in tools described above in that each of therollers 34 has a keg-shaped circumferential profile that serves as guide means for centrally guiding the transmission member over therollers 34. - Naturally, a combination of guide means shown in
FIGS. 4-6 is also possible. - Though the present invention was shown and described with references to the preferred embodiments, such are merely illustrative of the present invention and are not to be construed as a limitation thereof and various modifications of the present invention will be apparent to those skilled in the art. It is, therefore, not intended that the present invention be limited to the disclosed embodiments or details thereof, and the present invention includes all variations and/or alternative embodiments within the spirit and scope of the present invention as defined by the appended claims.
Claims (5)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE102007060425 | 2007-12-14 | ||
DE102007060425.6 | 2007-12-14 | ||
DE102007060425A DE102007060425A1 (en) | 2007-12-14 | 2007-12-14 | Hand-guided tacker |
Publications (2)
Publication Number | Publication Date |
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US20090152321A1 true US20090152321A1 (en) | 2009-06-18 |
US7870988B2 US7870988B2 (en) | 2011-01-18 |
Family
ID=40418383
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/316,541 Active 2029-04-17 US7870988B2 (en) | 2007-12-14 | 2008-12-12 | Hand-held spring-driven drive-in tool |
Country Status (5)
Country | Link |
---|---|
US (1) | US7870988B2 (en) |
EP (1) | EP2070656A3 (en) |
JP (1) | JP2009142983A (en) |
CN (1) | CN101456177B (en) |
DE (1) | DE102007060425A1 (en) |
Cited By (3)
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US20110303720A1 (en) * | 2010-06-15 | 2011-12-15 | Hilti Aktiengesellschaft | Electrically operable bolt driving tool |
US20110303726A1 (en) * | 2010-06-15 | 2011-12-15 | Hilti Aktiengesellschaft | Driving device |
US20120325887A1 (en) * | 2011-04-19 | 2012-12-27 | Hilti Aktiengesellschaft | Fastener driving tool |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102011089720A1 (en) * | 2011-12-23 | 2013-06-27 | Hilti Aktiengesellschaft | driving- |
US9827658B2 (en) | 2012-05-31 | 2017-11-28 | Black & Decker Inc. | Power tool having latched pusher assembly |
US11229995B2 (en) | 2012-05-31 | 2022-01-25 | Black Decker Inc. | Fastening tool nail stop |
US10434634B2 (en) | 2013-10-09 | 2019-10-08 | Black & Decker, Inc. | Nailer driver blade stop |
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Also Published As
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US7870988B2 (en) | 2011-01-18 |
CN101456177B (en) | 2012-08-08 |
DE102007060425A1 (en) | 2009-06-18 |
EP2070656A3 (en) | 2010-06-23 |
JP2009142983A (en) | 2009-07-02 |
CN101456177A (en) | 2009-06-17 |
EP2070656A2 (en) | 2009-06-17 |
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